National Weather Service United States Department of Commerce

A significant winter storm will impact the northern Rockies through Saturday accompanied by a cold wave into early next week. Overnight temperatures will plummet to well below zero by Sunday morning.

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Last Map Update: Fri, Jan. 27, 2023 at 6:44:26 am MST

National Weather Service Spokane, WAZoom

National Weather Service Great Falls, MT
National Weather Service Pendleton, ORNational Weather Service Boise, IDNational Weather Service Pocatello, ID

A winter storm is taking shape for the Northern Rockies beginning on Friday. At this time, snowfall amounts of at least 4 inches are expected in valley locations, with over 8 inches in the mountains and at mountain passes. Higher snowfall amounts, exceeding 12 inches in the mountains and 6 inches in valleys, are possible. Reduced visibility from falling and blowing snow can be expected. In addition, a flash freeze is possible on area roads from rapidly falling temperatures Friday night into Saturday morning. Continue to monitor the forecast for the latest updates on this developing storm.
A strong push of Arctic air is expected across western Montana beginning Friday night. Rapidly dropping temperatures may lead to additional travel impacts with flash freeze potential Friday night into Saturday. Those planning to travel should be prepared for changing and potentially hazardous road conditions.
An Arctic cold front will be impacting the Northern Rockies beginning on Saturday, with sub-zero low temperatures across western Montana expected by Sunday morning. By Monday morning, most of north-central Idaho will see low temperatures below zero as well. The coldest temperatures are expected through Tuesday morning. The cold will be dangerous for anyone caught unprepared. Cold will also be hazardous for pets and vulnerable livestock. Most locations in western Montana and north-central Idaho are likely to see low temperatures between 10 and 20 below zero. Areas along the Continental Divide could drop to 30 below zero.


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